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Light, yes, confusion, no....
From my Chevrolet Radio books, here's the scoop.
The '64 Corvette version of the AM/FM radio calls out 7287620 for the vol/tone/switch assy which is the same as what you report for 1963. Additionally, a similar AM/FM radio was offered for full size Chevy's that year but its vol/tone/switch is listed with a different PN, 7287414. Now things get interesting!
In '65, there were four versions of AM/FM radios (Corvette, Chevy II, Chevelle and full size Chevy). ALL of these are listed with multiple PN's for the vol/tone/switch meaning it was a pick 'n choose situation on the assy line -- all are considered equal substitutes! The list consists of:
7290296
7290633
7290641
7290744
7291126
Exactly what the differences are between these parts, I can't say. The radio service & shop manuals do NOT define their specifics (pot resistance range, taper, power dissipation characteristics or mechanical dimensions).
Nor do the tech books describe any circuit 'tweaks' in the '65 version of the radio for rationale as to why there's such a wide range of component interchange or speak to why a single/different Delco PN is called out for the earlier version of the AM/FM radio....
My take would be: go install the replacement component you've got (it's not that big of a swap job) and play with the chassis on your bench. Do you find anything noticeable or objectionable with the substitute part? -
Gordon Peterson's was a a 63 radio like yours and he replaced the tone-volume switch with a 7290296. You might ask him how he finally made out with the difference in the volume range ohms.
I replaced mine with the same switch but on a 67 radio (same as 65 to 67). I do have the 65 manual and wiring diagram for radio 986281 in a pdf format. It is about a 2.2 meg file, and if you want it, email me.
On the back of the 7290296 switch are 4 lugs, two with an R between them and two with an L between. I assume is R is radio and L is the light, it is a matter to determine which is the feed and which is the load (which should not be too hard).
Hope this helps, I'll be glad to email the manual and wiring diagragm.
Jerry Fuccillo
#42179Jerry Fuccillo
1967 327/300 Convertible since 1968Comment
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Re: C2 Radio Volume Control Switch Resistance
Gerry,
If you have it out and on the bench then why not try a 10K resistor across the 21K if the Vol control seems objectionable? This should bring the 21K back down to approx. 10KComment
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Re: C2 Radio Volume Control Switch Resistance
Alan, great suggestion for a tweek, thou I believe a 10K resistor is too low and yields a 6.7K pot. When I play with this I will likely try a 20K resistor ... yields a 10K pot.
Thanks everybody. Gerry LehmannComment
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